Department of Psychiatry and Behavioral Sciences, Emory University, 101 Woodruff Circle, Suite 4000, Atlanta, GA 30322, United States.
Psychoneuroendocrinology. 2013 Jan;38(1):84-93. doi: 10.1016/j.psyneuen.2012.05.001. Epub 2012 May 29.
Early life stress precipitates dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis and this effect is most pronounced in females. The mechanisms that mediate female sensitivity to stress-induced HPA axis dysregulation are unknown. The purpose of this study was to determine whether sex moderates the effects of chronic adolescent stress on glucocorticoid receptor (GR) translocation and moderators of the GR system. Female adolescent rats with a history of chronic stress exposure demonstrated a delayed resolution of the plasma corticosterone response to an acute stressor and this delay was accompanied by attenuated GR translocation compared to control adolescent females. The chronic stress-induced phenotype in females was similar to the baseline phenotype in male adolescent rats. Conversely, the expression patterns of GR moderators/co-chaperones became more sexually dimorphic following chronic stress, suggesting divergent function of the GR system between male and female adolescent rats. Gene expression of Ppid, a positive regulator of the GR, was predicted by plasma estradiol and 34% lower in control adolescent females than males, indicating that sex steroids may play a role in the sexually dimorphic response. After chronic adolescent stress, females displayed elevated hippocampal expression of Bag1 and Ppid genes that was not observed in males. Overall, the GR output to an acute stressor, illustrated by transcription of Nr3c1 (encoding the GR), Bag1, Fkbp5, Ppid, and Src1, was significantly upregulated and differed in a sex-specific and chronic stress-dependent manner. This study provides new evidence for sex differences during development and adaptation of the glucocorticoid receptor chaperone system.
早期生活压力会导致下丘脑-垂体-肾上腺 (HPA) 轴失调,而这种影响在女性中最为明显。介导女性对应激诱导的 HPA 轴失调的敏感性的机制尚不清楚。本研究旨在确定性别是否调节慢性青春期应激对糖皮质激素受体 (GR) 易位的影响以及 GR 系统的调节剂。有慢性应激暴露史的雌性青春期大鼠表现出对急性应激源的血浆皮质酮反应的延迟缓解,与对照青春期雌性大鼠相比,这种延迟伴随着 GR 易位的减弱。雌性慢性应激引起的表型与雄性青春期大鼠的基线表型相似。相反,GR 调节剂/共伴侣的表达模式在慢性应激后变得更加性别二态,表明雄性和雌性青春期大鼠的 GR 系统功能不同。GR 的正调节剂 Ppid 的基因表达受血浆雌二醇的预测,且在对照青春期雌性大鼠中比雄性低 34%,表明性激素可能在性别二态反应中发挥作用。在慢性青春期应激后,雌性大鼠海马中 Bag1 和 Ppid 基因的表达升高,而雄性大鼠则没有观察到这种情况。总的来说,急性应激源对 GR 的输出,由 Nr3c1(编码 GR)、Bag1、Fkbp5、Ppid 和 Src1 的转录来表示,显著上调,并以性别特异性和慢性应激依赖性的方式不同。本研究为糖皮质激素受体伴侣系统在发育和适应过程中的性别差异提供了新的证据。
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